Gas Source Rock Features and Controlling Factors for Biogas Formation in Holocene Series in Zhejiang Coastal Plain

Lin Chunming; Qian Yizhong

The gas source rocks in this area are mainly grey mud deposited in inner sublittoral enviornment and grey-greyish black muddeposited in flood land environment influenced by sea water. Shallow-sea facies gas source rock deposited in weak reduction-reduc-lion environment, and flood land facies gas source rock deposited in light reduction-high reduction environment. On the whole, thelatter has higher reductibility and stronger gas-yielding capacity than the former, and which in the north is higher or stronger thanthat in the south of Zhejiang province. Formation of the biogas were controlled by seven main factors, namely depositional environ-went, depositional time, paleoclimate, sea level change, crustal subsidence, rate of deposition and water medium. It's favorableinfluence to mass production and enrichment of biogas in flood land facies gas source rock, when these factors interact and influenceeach other.

1. Marine Geology and Geophysics Department,Tongji University,Shanghai 200092;

2. Hangzhou Institute of Petroleum Geology,Hangzhou

Received Date: 1997-02-28

Key words:

Abstract: The gas source rocks in this area are mainly grey mud deposited in inner sublittoral enviornment and grey-greyish black muddeposited in flood land environment influenced by sea water. Shallow-sea facies gas source rock deposited in weak reduction-reduc-lion environment, and flood land facies gas source rock deposited in light reduction-high reduction environment. On the whole, thelatter has higher reductibility and stronger gas-yielding capacity than the former, and which in the north is higher or stronger thanthat in the south of Zhejiang province. Formation of the biogas were controlled by seven main factors, namely depositional environ-went, depositional time, paleoclimate, sea level change, crustal subsidence, rate of deposition and water medium. It's favorableinfluence to mass production and enrichment of biogas in flood land facies gas source rock, when these factors interact and influenceeach other.

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Gas Source Rock Features and Controlling Factors for Biogas Formation in Holocene Series in Zhejiang Coastal Plain

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